My custom context menu additions are doubling up when right clicking any folder in the Navigation Pane

Solution 1:

It doesn't seem to happen if the menu item key names are identical. If you look a the default cmdentry, for example:

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\Directory\Background\Shell\cmd]
@="@shell32.dll,-8506"
"Extended"=""
"HideBasedOnVelocityId"=dword:00639bc8
"NoWorkingDirectory"=""

[HKEY_CLASSES_ROOT\Directory\Background\Shell\cmd\command]
@="cmd.exe /s /k pushd \"%V\""

[HKEY_CLASSES_ROOT\Directory\Shell\cmd]
@="@shell32.dll,-8506"
"Extended"=""
"HideBasedOnVelocityId"=dword:00639bc8
"NoWorkingDirectory"=""
 
[HKEY_CLASSES_ROOT\Directory\Shell\cmd\command]
@="cmd.exe /s /k pushd \"%V\""

This proved true with a user-created item as well.

• Identical key names, even with different (Default) values, did not "duplicate". So take a look at your registry entries, or export and edit your question with the relevant export files.